Good luck with the IEEE efforts John. I know our standards guy Pete Anslow agrees with you that 400GbE is the logical next step, as he detailed here: http://www.ciena.com/connect/blog/400GbE-versus-Terabit-Ethernet-First-steps-toward-an-answer.html

400 GbE is the only number that makes sense, we will not be able to do a Terabit...and even for 400 GbE it will have to be a parallel I/O interface, a serial 400 GHz driver is not in cards in CMOS...Kris